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The sampling procedures, locations and results of these tests aze presented in Appendix A. The <br />results show that the ore has the potential to generate leachate and surface water runoff containing <br />• elevated levels of uranium, radium, and trace metals (see Section 6). The waste rock, however, did <br />not produce leachate that exceeded state water quality standazds. The following Best Management <br />Practices (BMPs) for disposal and reclamation of waste rock will also minimize the potential for <br />impacting surface or ground water resources. <br />Waste Embankment BMP's <br />1) In the SPLP test, the ore is ground to a minute size (i.e., smaller than 9.5 millimeters) prior to <br />leaching with a pH 5 solution, while the actual waste rock embankment site will have larger sized <br />rocks from one inch to twenty-four inches in diameter, that will not leach as readily. The <br />permeability of the waste rock (and susceptibility to leaching) will also be reduced by the <br />compaction that occurs as loaded haulage buggies and other equipment travel over the top of the <br />waste pile. <br />• 2) Undisturbed runoff from the south hillside will be permanently diverted away from the waste <br />rock embanlanent, utilizing diversion ditches designed for the 100-year, 24-hour storm event. <br />3) The waste rock embankment will be covered with a minimum of twelve inches of topsoil and <br />planted with a stable mix of grasses and forbs well suited to this location. The vegetation will utilize <br />most of the direct precipitation and surface water runoff that occurs on the reclaimed embanlanent. <br />This will minimize the amount of water that can percolate into the reclaimed waste material. <br />4) The gradual slopes and revegetated surface of the waste rock embankment will minimize erosion <br />of topsoil and prevent exposure of the underlying waste rock. <br />Based on the appazent stability of the existing reclaimed and older, unreclaimed waste rock pile <br />slopes in the azea, a detailed slope stability analysis was not performed. Many of these older mines <br />have slopes as steep as 1.4H:1 V compared to the 3H:1 V proposed minimum slope of the Whirlwind <br />waste rock embankment. The spring and seep survey of the site conducted by Greg Lewicki, P.E. in <br />.~ <br />Whirlwind Mine June 07 D-12 <br />